使用 IFileOperation 在复制期间创建目录

问题描述

使用 Stephen Toub 的 C# 的 IFileOperation 包装器(link)，到目前为止一直运行良好.现在我正在尝试复制以从网络位置收集文件，每个网络位置到它自己的子目录中.

Using Stephen Toub's IFileOperation wrapper for C# (link), which has been working well until now. Now I am trying to do a copy to gather files from network locations, each network location into its own subdirectory.

\FOOdata 到 C:gatherFoo_data
\BARmanagecurrent 到 C:gatherarmanage

等等.问题出在 FileOperation.CopyItem 中.一定是因为目标目录还不存在——IFileOperation 会在复制过程中创建它，对吧?我使用了 another question 中的技术并更改了 Toub 的FileOperation.CreateShellItem 到这个:

And so on. The problem is in FileOperation.CopyItem. It must be because the destination directory doesn't exist yet—IFileOperation will create it during the copy, right? I used the technique from another question and changed Toub's FileOperation.CreateShellItem to this:

private static ComReleaser<IShellItem> CreateShellItem( string path )
{
    try
    {
        return new ComReleaser<IShellItem>( (IShellItem)SHCreateItemFromParsingName( path, null, ref _shellItemGuid ) );
    }
    catch ( FileNotFoundException )
    {
        IntPtr pidl = SHSimpleIDListFromPath( path );
        IShellItem isi = (IShellItem)SHCreateItemFromIDList( pidl, ref _shellItemGuid );
        Marshal.FreeCoTaskMem( pidl );
        System.Diagnostics.Debug.WriteLine( "Shell item: " + isi.GetDisplayName( SIGDN.DesktopAbsoluteParsing ) );
        return new ComReleaser<IShellItem>( isi );
    }
}

我将 Debug.WriteLine 卡在其中以检查它是否正常工作，并且似乎工作正常；它会写回路径.

I stuck the Debug.WriteLine in there to check that it's working, and it seems to be working fine; it writes the path back out.

但是 IFileOperation.CopyItem 抛出 ArgumentException，我不知道为什么.我没有正确执行IShellItem for a nonexistent file"吗?我怀疑我需要在其中获取 SFGAO_FOLDER，因为我正在尝试为不存在的 directory 创建一个 IShellItem，而不是文件，但是如何?

But IFileOperation.CopyItem throws an ArgumentException, and I can't figure out why. Am I not doing the "IShellItem for a nonexistent file" correctly? I suspect I need to get SFGAO_FOLDER in there, since I am trying to create an IShellItem for a nonexistent directory, not file, but how?

推荐答案

在这个周末(多么疯狂的派对周末)进行了大量谷歌搜索和编码实验后，我找到了解决方案.

After a lot of Googling and coding experimentation this weekend (what a wild party weekend), I found a solution.

1. 编写一个实现IFileSystemBindData的COM兼容类.
2. 分配一个 WIN32_FIND_DATA 结构并设置它的 dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY.(其他成员在这里无关紧要，据我经过一些测试后得知.)
3. 创建您的 IFileSystemBindData 类的实例.
4. 将您的 WIN32_FIND_DATA 对象传递给 IFileSystemBindData::SetFindData.
5. 创建一个 IBindCtx 的实例.
6. 使用 STR_FILE_SYS_BIND_DATA 的参数调用它的 IBindCtx::RegisterObjectParam (#defined as L"File System Bind Data") 和您的 IFileSystemBindData 对象.
7. 使用要创建的目录的路径名和您的 IBindCtx 对象调用 SHCreateItemFromParsingName.

1. Write a COM-compatible class that implements IFileSystemBindData.
2. Allocate a WIN32_FIND_DATA structure and set its dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY. (The other members are irrelevant here, as far as I can tell after some testing.)
3. Create an instance of your IFileSystemBindData class.
4. Pass your WIN32_FIND_DATA object to IFileSystemBindData::SetFindData.
5. Create an instance of IBindCtx.
6. Call its IBindCtx::RegisterObjectParam with arguments of STR_FILE_SYS_BIND_DATA (#defined as L"File System Bind Data") and your IFileSystemBindData object.
7. Call SHCreateItemFromParsingName with the pathname of the directory to create, and your IBindCtx object.

它有效.binding-context 对象告诉 SHCreateItemFromParsingName 不要查询文件系统，而只使用它给出的内容.我让 IFileOperation 将文件复制到新的且命名巧妙的目录 D:SomePathThatDidNotPreviousExist 中，它创建了所有沿途有七个目录.据推测，同样的技术可用于为任何不存在的文件系统对象创建 IShellItem，具体取决于您在 dwFileAttributes 中输入的内容.

It works. The binding-context object tells SHCreateItemFromParsingName not to query the filesystem, and just use what it's given. I got IFileOperation to copy a file into the new and cleverly-named directory D:SomePathThatDidNotPreviouslyExist, and it created all seven directories along the way. Presumably this same technique could be used to create an IShellItem for any non-existent filesystem object, depending on what you put in dwFileAttributes.

但这很丑.我希望有更好的方法.我的编码实验是在 C++ 中进行的.现在编写 COM 互操作的东西以在 C# 中再次执行此操作.或者，放弃项目并使用 C++ 重新开始会更容易.

But it's ugly. I hope there's a better way. My coding experimentation was in C++; now to write the COM interop stuff to do it again in C#. Or maybe it will be easier to throw out the project and start over in C++.

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